latest web site changes
diff --git a/docs/dev/dev-guide/building_hono/index.html b/docs/dev/dev-guide/building_hono/index.html
index 292476e..356b1b5 100644
--- a/docs/dev/dev-guide/building_hono/index.html
+++ b/docs/dev/dev-guide/building_hono/index.html
@@ -21,19 +21,19 @@
     <title>Building from Source :: Eclipse Hono&trade; Vers.: dev</title>
 
     
-    <link href="/hono/docs/css/nucleus.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/fontawesome-all.min.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/hybrid.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/featherlight.min.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/perfect-scrollbar.min.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/auto-complete.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/theme.css?1592443432" rel="stylesheet">
-    <link href="/hono/docs/css/hugo-theme.css?1592443432" rel="stylesheet">
+    <link href="/hono/docs/css/nucleus.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/fontawesome-all.min.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/hybrid.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/featherlight.min.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/perfect-scrollbar.min.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/auto-complete.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/theme.css?1592529823" rel="stylesheet">
+    <link href="/hono/docs/css/hugo-theme.css?1592529823" rel="stylesheet">
     
-      <link href="/hono/docs/css/theme-hono.css?1592443432" rel="stylesheet">
+      <link href="/hono/docs/css/theme-hono.css?1592529823" rel="stylesheet">
     
 
-    <script src="/hono/docs/js/jquery-2.x.min.js?1592443432"></script>
+    <script src="/hono/docs/js/jquery-2.x.min.js?1592529823"></script>
 
     <style type="text/css">
       :root #header + #content > #left > #rlblock_left{
@@ -83,14 +83,14 @@
     <span data-search-clear=""><i class="fas fa-times"></i></span>
 </div>
 
-<script type="text/javascript" src="/hono/docs/js/lunr.min.js?1592443432"></script>
-<script type="text/javascript" src="/hono/docs/js/auto-complete.js?1592443432"></script>
+<script type="text/javascript" src="/hono/docs/js/lunr.min.js?1592529823"></script>
+<script type="text/javascript" src="/hono/docs/js/auto-complete.js?1592529823"></script>
 <script type="text/javascript">
     
         var baseurl = "https:\/\/www.eclipse.org\/hono\/docs\/\/dev";
     
 </script>
-<script type="text/javascript" src="/hono/docs/js/search.js?1592443432"></script>
+<script type="text/javascript" src="/hono/docs/js/search.js?1592529823"></script>
 
     
   </div>
@@ -537,9 +537,28 @@
  
   
     
-      <li data-nav-id="/hono/docs/dev/admin-guide/device-registry-config/" title="Device Registry Configuration" class="dd-item ">
-        <a href="/hono/docs/dev/admin-guide/device-registry-config/">
-        Device Registry Configuration
+      <li data-nav-id="/hono/docs/dev/admin-guide/file-based-device-registry-config/" title="File Based Device Registry Configuration" class="dd-item ">
+        <a href="/hono/docs/dev/admin-guide/file-based-device-registry-config/">
+        File Based Device Registry Configuration
+        
+        </a>
+    </li>
+     
+  
+ 
+
+            
+          
+            
+            
+
+
+ 
+  
+    
+      <li data-nav-id="/hono/docs/dev/admin-guide/mongodb-device-registry-config/" title="MongoDB Based Device Registry Configuration" class="dd-item ">
+        <a href="/hono/docs/dev/admin-guide/mongodb-device-registry-config/">
+        MongoDB Based Device Registry Configuration
         
         </a>
     </li>
@@ -2114,6 +2133,22 @@
             
         
                     
+                        
+            
+            
+                
+                    
+                
+                
+
+                    
+                    
+                    
+
+                    
+            
+        
+                    
             
         
                     
@@ -2521,20 +2556,20 @@
     <div style="left: -1000px; overflow: scroll; position: absolute; top: -1000px; border: none; box-sizing: content-box; height: 200px; margin: 0px; padding: 0px; width: 200px;">
       <div style="border: none; box-sizing: content-box; height: 200px; margin: 0px; padding: 0px; width: 200px;"></div>
     </div>
-    <script src="/hono/docs/js/clipboard.min.js?1592443432"></script>
-    <script src="/hono/docs/js/perfect-scrollbar.min.js?1592443432"></script>
-    <script src="/hono/docs/js/perfect-scrollbar.jquery.min.js?1592443432"></script>
-    <script src="/hono/docs/js/jquery.sticky.js?1592443432"></script>
-    <script src="/hono/docs/js/featherlight.min.js?1592443432"></script>
-    <script src="/hono/docs/js/html5shiv-printshiv.min.js?1592443432"></script>
-    <script src="/hono/docs/js/highlight.pack.js?1592443432"></script>
+    <script src="/hono/docs/js/clipboard.min.js?1592529823"></script>
+    <script src="/hono/docs/js/perfect-scrollbar.min.js?1592529823"></script>
+    <script src="/hono/docs/js/perfect-scrollbar.jquery.min.js?1592529823"></script>
+    <script src="/hono/docs/js/jquery.sticky.js?1592529823"></script>
+    <script src="/hono/docs/js/featherlight.min.js?1592529823"></script>
+    <script src="/hono/docs/js/html5shiv-printshiv.min.js?1592529823"></script>
+    <script src="/hono/docs/js/highlight.pack.js?1592529823"></script>
     <script>hljs.initHighlightingOnLoad();</script>
-    <script src="/hono/docs/js/modernizr.custom.71422.js?1592443432"></script>
-    <script src="/hono/docs/js/learn.js?1592443432"></script>
-    <script src="/hono/docs/js/hugo-learn.js?1592443432"></script>
+    <script src="/hono/docs/js/modernizr.custom.71422.js?1592529823"></script>
+    <script src="/hono/docs/js/learn.js?1592529823"></script>
+    <script src="/hono/docs/js/hugo-learn.js?1592529823"></script>
 
-    <link href="/hono/docs/mermaid/mermaid.css?1592443432" type="text/css" rel="stylesheet" />
-    <script src="/hono/docs/mermaid/mermaid.js?1592443432"></script>
+    <link href="/hono/docs/mermaid/mermaid.css?1592529823" type="text/css" rel="stylesheet" />
+    <script src="/hono/docs/mermaid/mermaid.js?1592529823"></script>
     <script>
         mermaid.initialize({ startOnLoad: true });
     </script>